Make positive sentences in Present Perfect Continuous as in the example.
How long have you been cleaning the house?
I have been cleaning the house since lunchtime.
1.How long has it been snowing?
(since 5 o’clock)It has been snowing since 5 o’clock.2.How long have they been skiing?
(for three hours)They have been skiing for three hours.3.How long has Natalie been looking for a job?
(for months)Natalie has been looking for a job for months.4.How long have you been studying economics?
(since 2017)I have been studying economics since 2017.5.How long has Chris been traveling around the world?
(for a year)Chris has been traveling around the world for a year.6.How long have they been preparing for the exam?
(since Thursday)They have been preparing for the exam since Thursday.7.How long has your friend been running his own business?
(since he was thirty)My friend has been running his own business since he was thirty.8.How long have they been building the bridge?
(since March)They have been building the bridge since March.9.How long have your neighbors been fighting?
(all evening)My neighbors have been fighting all evening.10.How long has she been reading this book?
(for two days)She has been reading this book for two days.